Dynamo-electric machine.



J. BURKE.

DYNAMo ELECTRIC MACHINE.

APPLICATION FILED OCT-9.1901. 19185 366, Patented May 30,1916.

7 4 SHEETS-SHEET l.

l. BURKE.

DYNAMO ELECTRIC'MACHINE. `^PPL|cATmN msn 001.9. 1901.

1,1 85,366. Patented May 30, `1916 4 SHEETS-SHEET 2.

l. BURKE. DYNAMO ELECTRIC MACHINE. APPLICATION man oc. 9, 1901.

1 ,1 85,366. Patented May 80, 1916.

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w Y" h/41d: ,y y AH, zz t7 zZ gli@ M v J4/manto@ /ae MMA 1. BURKE. DYAIUELECTRIC MACHINE. APPLICATION min ocr. 9. 1901.

1,1 85,366. I Patented May 30, 1916.

I 4 SHEETS- SHEET 4- UNITED sTATEs PATENT oEEIoE. i

JAMES BURKE, OF ERIE, PENNSYLVANIA, ASSIGNOR- T0 BURKE ELECTRIC COMPANY,A CORPORATIQN 0]? PENNSYLVANIA.

' DYNAMO-LECTRC MACHINE.

Application led October 9, 1907.

'o all whom i may concern Be it known that I, JAMES BURKE, a citizen ofthe United States, residing at Furie, in the county of Erie and State ofPennsylvania, have invented certain new and useful Improvements inDynamo-Electric Machines,` of which the following is a full, clear, andexact specification.

My invention relates to 'dynamo electric machines, and to variousfeatures of construction, theV object of my invention being in generalthe construction ,of machines which will-have a high degree ofeiliciency, be adapted to be Well ventilated throughout and be simpleand economical in construetion.

My invention is particularly applicable to the construction of thestationary element of such machines.

One of theimportant features of my invention relates tothe constructionand arrangement of the laminae with special reference to machines ofsmall construction comparatively.

Prior to' y'invention it has been customary to build up the laminatedportion of laminael each forming a circular disk. By

my present inventior, the -form of the lamina: instead of being circularon the outer periphery, is of such form that by assembling the laminaein a certain manner, the amount ofradiating surface is greatlyincreasedl and also by reason of the form of the laminae, I secure avery material saving in amount of waste material in punching the laminaefrom the sheet metal as will be chmo.

Another feature of Iny invention relates to means for accurately andsimply adjusting the position of the rotating element.

In machines having small air gaps. if .the rotating element is properlycentered when the machine is first. operated, the wear of the bearingswill cause the air gap at the Specification of Letters Patent.

Patented May 30, 1916.

Serial No. 396,563.

lower part of the machine to be decreased a. comparatively large amountand that at the upper correspondingly increased. By my invention Iprovide suitable means whereby the rota ting element may be quickly andaccurately adjusted to its proper position.

These and other features of my invention will be understood from thefollowing description and accompanying drawings, in which-- Figure l isa vertical sectional view oi one form of machine embodying certainfeatures of my invention; Fig. '2 isan end view thereof; Fig. t), is aside view of the field framev partijv in section and with certain partsremoved; Fig. 4 is a face view of the laminar showing their forinrandmanner of assembling; Fig. 5 is an edge view of assembled laminare; Fig.6 is an explanatory diagram; Fig. 7 is a sectional view of end bracketand adjoining portions of the main trame of a machine embodying certainadditional Jfeatures of my invention; Fig. 8 an end view thereof; Fig. 9is a side view of adjusting means for the end bracket shown in Fig. 7and Fig. 8; and Fig. 10 is an end view of the adjusting means with thebolt and nuts removed.

Figs. 1 to 3 inclusive, illustrate the construction of au inductionmotor, the shaft l of which supports a spider 2 having Ithe outwardly(attending portions 3, 4.' YThe spider supports the lam-imc 5 of therotating element. and which are clamped between the end rings G, whichhave extensions for supporting the windings 7 of the rotating element.The main frame is shown at 8, and is provided with ventilating openings9 on its outer cylindrical surface as indicated in Fig. 3. The frame 8extends outwardly at the ends to such an extent as to cover and shieldthe armature'windings 1() of the stationary element, and is providedwith inwardly extending side portions -l1, 12. From the side portion 11extends a series vof inwardly projecting ribs 13 as shown in F ig. 3,these ribs being spaced angularly at about 45 degrees from each otherand extend inwardly beyond the' middle of the main frame, but donotextend the full width of the machine. .From the side p0rtion l2 extendsa corres )onding set of ribs i4, and -which overlap tiev ribs 13,leaving however a considerable space between them,

` ribs 13 and 14 and through the openings 9.

The air currents which are lformed by reason of thisV construction ofthe ribs, tend to create 'a continual flow of air throughout all theparts and la rg ily avoid formation of air chambers with no circulation,and which, if not avoided cause unnecessary heating of the machine.'

One form of laminas andmanner of assembling which invoives an importantfeature of my invention is illustrated in Figs. 4, 5 and 6. 'It has beencustomary to punch the` lamin with a circular outline on the outerperiphery when used in the ,stationary element, as indicated by thedotted lines 16, in Fig. (i. It is apparent from this figure that incutting such a circular disk from sheet metal there is a considerablewaste of material at the corners, the outline of the V square platerequired being indicated by the character 17. In accordance with myinvention the laminas are not cutin the circular form, and i therebyconsiderably reduce the amount of waste metal. My preferred forni isindicated in full lines in Fig. 6, and the laminac are given someoctagonalv form having the four opposite sides 18 and the four rounded'corners 19. The rounded parts 19 are on the sic of the same circle andare adapted to lit within the ribs 13, 14 of the main fraise.The'keywvay 2 0 in the laminar; is made at about the junction of one ofthe straight parte i8 and a Curved part 19. In thebfittcinief themainframe is formed a rib 2l, sonifeivuat heavier than the others andwhichlfis pro-vided with a keyway adapted to vc the key 22, which alsoengages the 'key ,y 2O of the laminae and so prevent asi, gul-ardisplacement of the laminac.

V'hen tne laminas are assembled certain of them are reversed so that arounded part of one lamina 1s adjacent to the straight .part of anadjoining lamina,

although the teeth and key-way always coincide. This arrangement will beunderstood from Figs. 4 and 5, the front lamina' in Fig. 4 being shownin a heavy full line, and the laminac in the rear which are reversedbeing indicated bya light line which is partly dotted. 'if desired,alternate laminac may be reversed or several adjoining lamina: may beassembled in the same manner and then a corresponding number ofadjoining laminae reversed and so on, but

` it is very likely ery of thellaminaeprodu'cesavery much in'- l creasedradiating sists in keeping the motor at a low temperature. Not only isthe radiating surface greatly increased by this form of construction,but the uniformity of the path of the magnetic iux is preserved, andmoreover an important saving of the sheet iron is attained. IIt willalso be seen that only one form of die is necessary for'punching all ofthe laminae. The lamina: will, of course', preferably be provided withteeth adapted to receive the windings 10. The ribs ,13 are shownprovided with shoulders 23 which retain the Aend plate on one sideof'the assembled laminae in position, and for retaining the opposite.end plate, any suitable form of key may be. inserted into key-ways 24of the ribs 14. Y Y A The construction of the end brackets and thelocation of the bearings for, the shaft 1 are such as to avoid as far/aspossible, improper centering of the` shaft. The endA brackets are ofSimilar construction and comprise a bearing 25 of suitable form, fromwhich extend the arms 26 to the 27. The circular rims 27 seat incorresponding recesses in the side main frame. The end brackets arefixed in position vin any suitable manner, as by the bolts 28 which passthrough the rims 27 and engage the side portions of the main frame. .Yof Fig. 1,

It will be s een from aninspection that the bearing in each end bracketclosely approaches the spider 2 of the rotating element coming somewhatwithin the extensions 3 and 4 thereof, and within the end coniections ofthe conductors on the rotating element.v Also the main frame 8 extendsbeyond the end connections of the stator wind-` ings, and the endbracket instead of being curved and. arching outwardly, ,is locatedthroughout in one plane substantially. This construction results in themiddle of the bearing being located substantially inthe plane of unionbetween the end bracket and the side ortion of the main frame. Thisconstructlon is particularly designed to over:- come inaccuracy inalinement of theV bear? ings and shaft when assembling or reassem-1bling the parts. If we assume that thepartsl` are originally `properlycentered and turned,`\.` to occur ythat in reassem` bling, the engagingsurfaces will not vbe clean and foreign materialmay oftentimes belocated between the engaging faces when bolting the end brackets inplace. Suppose for example, that in assembling an end bracket,- somematerial prevented` the face of outer rims portions 1'1, 12 of thesurface which greatly as the rim 27 from engaging the face of the sideportion 12 at the top of the frame and that the parts were separated atthat point by a certain fraction of an inch, whereas, at the bottomofthe frame the engagement of the end bracket Awas a proper one. Thiswould result of course in the to portion of the end bracket being locateoutwardl some distance on an arc of a circle of Whic the bottom of theend frame would be the center. With my form of construction, however,the displacement of the bearing from its proper position or fromalinement would not bc material, owing to the fact that the middle ofthe bearing is in the plane substantially with the face of the endbracket, the result being merely slight axial displacement of thebearing. On the other hand` if the hearing were located at aconsiderable -listai to. one side of the plane of the face of e, cudbracket, the bearing would not only he displaced somewhat axially, butbeing to one side of the plane of engagement between the end bracket andthe "i main frame, it would be displaced on the arc of a circle havingthe bottom of the end bracket as a center and would consequently bedisplaced materially below the proper position of alinemcnt, and thuscause a material di il `renfe in the alinement of the bearing and animproper change irr the air gap. Similarly, it will be seen that thelocation of some foreign material at any other point between the face ofthe end bracket and the main frame would cause a material displacementin the former types of construction. l

In large machines, where the weight of the rotating clement iscomparatively great and the tension considerable, the wear of thehearings which takes place causes the air gap below the rotatingelementto become diminished appreciably in the course of time and theair gap above the rotating element to be correspondingly increased.r Inmachines where this is likely to occur, it is de-y sirable to providesome convenient means of adjustment so as to easily and quickly centerthe rotating element. I accomplish this result by means of theconstruction illustrated in Figs. 7 to 10, inclusive. In Figs. 7 and 8,are indicated a side portion 29 of a main stationary frame 30, and anend bracket having a bearing 31 for journaling the shaft 32, the arms ofthe end bracket being shown at 33 and the outer rim at 34 which seats ina recess formed in the side portion 29.

It will be understood that the Construction of the remaining parts ofthe stationary and rotating elements may be such as shown in Figs. 1 to5, andare omitted in' Figs. 7 and 8 `as they scribed. The end bracketVwhen adjusted to proper position is clamped in place by the bolts 35which pass freely through holes in have already been de-| the endbracket and engage the side portion of the main frame. U on the mainframe at the bottom is forme a seat 36 upon the face of which are placedadjusting Wedges 38, 39, the former, being connected to the support 36by any suitable means such as dowel pins. The wedges 38, 39 have theirengaging face ,inclined as shown in Fig. 9, the wedge 38 aving a lu 4()through which the threaded bolt 41 of t e wedge 39 freel passes. ,Theposition of wedge 39 is ad) justed by turning the nut 42 against the lug40, the nut 43 serving as a lock nut. The upper face of the wedge'39engages the lower' face of a lug 44 formed on the end bracket. Movementof wedge 39 will therefore serve to adjust the end bracket to anydesired position. Further adjusting means for the end brackets and forixing the same in any desired position are provided by two lugs l5 on.opposite sides of the shaft. and which are on the inner ace of the endbracket as indicated by dotted lines in Fig. 8. A similar lug is formedat th'e upper part of the end bracket as shoivn at 46. Through theselugs extend adjusting bolts t7. the ends of which are adapted to engagethe inner periphery of the side portion of 4the mainframe, lt will heseen that by means of the bolts 47 in lugs 45, vthe end brackets may beadjusted sidewise in any desired position, and secured in such positionby screwing the bolts 35 up tightly against the main frame. Thus, bymeans of the adjusting wedges at the bottom of the end bracket', andfurther, by means of the adjusting bolts 47 in the lugs 45 and'46, meansare provided which serve to accurately and securely adjust the endbracket to any desired position, the bolts 35 serving to retain the endbracket in position after adjustment. Consequently, in assembling themachine, or when a nevi1 adjustment of the position of the rotatingelement is desired, the desired position and adjustment may be quicklyand accurately accomplished by means of my invention. Although one endbracket is shown in Figs. 7 and 8, it will be understood that a similarend bracket will be` provided at the opposite end of the ma'in frame.

Although I have illustrated aiid described specifically certain forms ofmy invention, it will be understood that my invention or certainfeatures thereof, may be embodied in other desirable forms ofconstruction Without departing from the scope of my invention.

Having thus described my invention,`I declare that what I claim as newand desire to secure by Letters Patent, is,-

' 1. In a dynamo electric machine, the combination ofa stationary frame,laminae sup ported within said frame and in fixed relation to saidframe, each of said lamin ex- `tiona ry frame,

tending a complete circumference but having a periphery formed ofstraight and curved portions, the' straight portions of certain of saidlaminas being displaced relative to the straight portions of certainother of said lamina?, thereby forming a core of substantially uniformmagnetic reluctance.

2. In a dynamo electric machine, bination of a stationary frame, laminaesupported within said frame and in fixed relation to said frame, each ofsaid laminae extending a^complete circumference but having a peripheryformed of alternate straight and curved portions` the straight portionsof'certain of said lamin being displaced relative to the straightportions of certain other of said laminae, thereby forming a core ofsubstantially uniform magnetic reluctance.

3. In a dynamo electric machine, the combination of a stationary frame,and laminae supported thereby, each lamina extending a completecircumference and having an outer periphery partly curved and partlystraight, certain of the laminas being alternately arranged so that acurved part of one lamina adjoins the straight partv of the next lamina.

i. In a dynamo electric machine, the combination of an outer stationaryframe, and lamina; within and supported by said frame, each of acompletecircumference, said laminae forming a core, the outer periphery ofnvhichis circumferentially recessed, substantially as described.

5. In a dynamo electric machine, the combination of an outer stationaryframe, and laminzc within and supported by said frame, each of saidlamin extending a complete circumference, said laminae forming a corethe outer periphery ofwhich is circumferentially recessed and all ofdthe laminzc being of similar outline. i

6. In a dynamo electric machine, the combination of an outer stationaryframe, laminar supported within said frame, each of Said laminacextending a complete circumference. a key between said frame and lamina,saidi laminac forming a core the outer periphery of which is recessedcircumferentially and all of the laminal being of similar outline.

In a dynamo electric machine, a stalaminar supported within said frame,each of said lamina? having a complete set of teeth on its innerperiphery and the outer periphery being other than circular, the lamina:being staggered with reference to each other so as to form exteriorcircumferential recesses.

8. In a dynamo electric machine, a statlonary supporting frame havinginwardly extending ribs which are in staggered relation to each otherand extend only partly across the frame, and lamin supported by saidribs, substantially as described.

9. In a dynamo electric machine, the combination of a frame havingsupporting ribs aranged in series and which extendfonly pai't of theWidth of said frame, one or more ribs of one series overlapping one ormore ribs of another series, .and laminac supported by said ribs.

10. In a dynamo electric machine, the combination of a stationaryexterior Ventilating openings, frame having ribs' arranged in aplurality of series extending inwardly but which extend only part of thewidth of said frame, one ormore ribs of one series overlapping one ormore ribs of another series forming interconnected airspaces, andlamina? supported by said ribs, substantiallj7 as described.

1].. In a dynamo electric machine, the combination of a stationaryframe, a rotating element, an end bracket for supporting the saidrotating element, and means adjustable on the inside of said end bracketfor adjusting the position of said end bracket relatively to said`frame.

12. The combination of a stationary element, a rotating element, an endbracket for supporting the shaft of said rotating element, and wedgingmeans interposed between said end bracket and said stationary elementfor adjusting the position of said end bracket with reference to saidstationary element in a vertical direction, said wedging means having asurface slidably movable relatively to said end bracket.

13.111 a dynamo electric machine, the combination of a rotating element,a stationary element, an end bearing bracket, the middle of the bearingand the'supporting portion of said bracket being located substantiallyin the plane of engagement between the bearing bracket and the mainframe, and means adjustable on the inside of said end bracket foradjusting the position of said cnd bracket relatively to said frame.

14. In a dynamo electric machine, the combination of a rotating element,a stationary element having outwardly extending windings, the main frameAof said stationary element extending outwardly to cover and shield saidwindings, an end bearing bracket having the middle of the bearing andthc supporting portion of said bracket located substantially in theplane of engagement between 'the end bracket and the main frame, and aplurality of adjusting devircs adjustable on the inside of said bcariqgbracket for adjusting the position of said bearing bracket relatively tothe main frame.

15. In a dynamo electricI machine, the combination of a frame hanna'lVentilating .mounted in Openings, said frame hai'ingribs extendinginwardly but a part of' the width thereof, which ribs over .ip ern'fhother to forni interconnected air s, i s, und la ai supported by saidribs and ari-ang f to foi'zi a core portion having circula erentialrecesses, substantially as described.

i6. ln a dynan'io electr e machine, a frame, en end head secmed mountedin said end b l, and adjustable means carried by said head ancL adjustable 0n the inside thereof' for shifting the position of said end ,laframe.

1.7. In a dynamo elevf've machine, a frame, an end head secured thereto,:i shaft said end head, .and adjustable 1 relatively o said means can'by said end i. or shite mg the possien of said end hemll rela thereto, ashaftto said frame, said adjustable means comprising a screw-threadedelement' adjustable on the inside of said end head.

ln a dynamo electric machine, a smne, a ve-ieally extendilfiqr end headsecured thereto, a horizontally extending s' it, mounted in said endhead, and. adjustable means for shifting the relative position of saidframe and said end head per- ;c-endieuny to the axis of said shaft, saidmea-fas comprising a screw-threeded element an the inside face of saidend head.

Y tesltiniony whereof I my signa- En presence of two Witnesses.

